An asymmetrical division is not like that, it's when a parent cell forms two cells that are different in some way.

而不对称分裂就不是这样,当母细胞分裂为两个子细胞时,会有一些不同

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This stem cell which is reproduced still has the potential to undergo asymmetric division but this one does not.

新生成的干细胞,仍然有潜能进行不对称分裂,但定向祖细胞就不行

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So if it's not a cell that's going through division you can't use a retrovirus to express the protein.

如果细胞不在分裂阶段,你就不能用逆转录病毒来表达某个蛋白

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It's not self-renewing, in that division of the zygote results in two daughter cells that are no longer the zygote anymore, they're down some pathway.

它是不会自我更新的,受精卵分裂后成了两个子细胞,而这两个子细胞就不再是受精卵了,它们沿着某种路径进行了分化

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Or it can the kind of change we talked about before, where during division there are some chemicals that are trapped in one cell and not in the other, and that could lead to a difference we already talked about.

可能是我们之前说过的,在分裂过程中可能发生的,不对称分裂的现象,并导致我们已经讲过的某些不同

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